Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Channels are a tool used for interprocess communication. An object may be sent over a channel, and a process is able to receive any objects sent over a channel it has a reference to. They are similar to pipelines, but may contain arbitrary unserialised objects instead of lines of text, and are used within a single program for coordination, rather than across several programs. They are inherently synchronous: a process waiting to receive an object from a channel will block until the object is sent. However, if they are used in a single-threaded or cooperatively scheduling system, they also resemble event-based programming models.

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